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冰川型海平面变化控制下的台地碳酸盐岩成岩作用:以陕西镇安西口石炭-二叠系界线剖面为例
引用本文:张海军,王训练,丁林,夏国英,王雷,王清山.冰川型海平面变化控制下的台地碳酸盐岩成岩作用:以陕西镇安西口石炭-二叠系界线剖面为例[J].地球科学,2007,32(3):329-338.
作者姓名:张海军  王训练  丁林  夏国英  王雷  王清山
作者单位:中国地质大学地球科学与资源学院,中国地质大学地球科学与资源学院,中国科学院青藏高原研究所,天津地质矿产研究所,中国地质大学地球科学与资源学院,中国地质大学地球科学与资源学院 北京100083 中国科学院青藏高原研究所,北京100085,北京100083,北京100085,天津300170,北京100083,北京100083
基金项目:国家自然科学基金 , 中国科学院知识创新工程项目 , 国家重点基础研究发展计划(973计划)
摘    要:以陕西镇安西口石炭-二叠系界线剖面为具体实例,探讨了冰川型海平面变化控制下的台地碳酸盐岩成岩作用规律.描述了陕西镇安西口石炭-二叠系界线剖面碳酸盐岩的各种成岩作用类型.根据成岩组构将研究区碳酸盐岩的成岩环境分为海水、大气淡水和埋藏环境.综合分析了各种成岩作用及其成岩环境的纵向分布特征.研究表明,剖面上碳酸盐岩成岩作用和成岩环境的特征与岩石在高频旋回中的相对位置存在明显的对应关系,受大振幅、高频率的冰川型海平面变化控制.早期海平面相对上升,形成旋回的下部单元,岩石首先经历海底成岩作用,随着上覆沉积物的增加,逐渐进入浅埋藏环境,成岩作用表现为以压溶、重结晶作用发育为主要特征.晚期形成旋回的上部单元,由于海平面相对下降,沉积物逐渐抬升,早期海底成岩作用尚未充分发育就脱离海水环境,进入大气淡水成岩环境,以强烈的大气淡水成岩作用为特征.

关 键 词:碳酸盐岩  成岩作用  高频旋回  冰川型海平面变化  石炭-二叠系界线  陕西镇安
文章编号:1000-2383(2007)03-0329-10
修稿时间:2006年5月29日

Carbonate Diagenesis Controlled by Glacioeustatic Sea-Level Changes: A Case Study of the Carboniferous-Permian Boundary Section at Xikou, Zhen'an County, Shaanxi Province, China
ZHANG Hai-jun,WANG Xun-lian,DING Lin,XIA Guo-ying,WANG Lei,WANG Qing-shan.Carbonate Diagenesis Controlled by Glacioeustatic Sea-Level Changes: A Case Study of the Carboniferous-Permian Boundary Section at Xikou, Zhen''''an County, Shaanxi Province, China[J].Earth Science-Journal of China University of Geosciences,2007,32(3):329-338.
Authors:ZHANG Hai-jun  WANG Xun-lian  DING Lin  XIA Guo-ying  WANG Lei  WANG Qing-shan
Abstract:Based on the case study on the platform-facies carbonate rocks of the Carboniferous-Permian boundary section being well developed and outcropped in Xikou,Zhen'an County,Shaanxi Province,China,this paper probes into the carbonate diagenesis controlled by glacioeustatic sea-level changes and its different patterns.In terms of mineralogical composition and microfabrics,diagenetic environments in the study area are divided into marine,near surface meteoric and burial environments.Comprehensive analysis is made on all patterns of carbonate diagenesis and the vertical distribution features of diagenetic environments.The analytical results reveal that carbonate diagenesis in the Carboniferous-Permian boundary section is related to the relative stratigraphic position of the rocks in the depositional cyclothem and is controlled by the glacioeustatic sea-level changes.There are distinctive differences in diagenetic patterns between lower transgressive sequence and upper regressive sequence in a cyclothem.The former is mainly characterized by pressure solution and recrystallization of mudstone and wackstone in burial environments,while the latter by cementation and leaching of freshwater in meteoric environments.
Keywords:carbonate  diagenesis  cyclothem  glacioeustatic sea-level changes  Carboniferous-Permian boundary  Zhen'an of Shaanxi
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